The chemical control of high-Tc superconductivity: Metal-superconductor-insulator transition in (Tl1-yPby)Sr2(Ca1-xYx)Cu2O7

R. S. Liu, P. P. Edwards, Shu-Fen Hu, D. A. Jefferson, Y. T. Huang, S. F. Wu, M. J. Tsai

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Abstract

We have carried out a detailed study of the relationship between the semiconducting, the superconducting, and the metallic region in the system (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7. The critical density (or concentration), nc, derived from Hall measurement of the titled series compounds at which the transition from insulator to metal place can be given by the well-known Mott formula: nc 1/3aH *=0.26 where aH * is the effective Bohr orbit radius of the isolated donor or acceptor state wavefunction. We propose that the insulator-metal transition in the cuprates generally occurs at a very high hole density (nc∼1020-1021cm-3) as compared to conventional doped semiconductors (nc∼1017-1018cm-3) but rather lower than the critical densities for elemental metals (nc>1021cm-3).

Original languageEnglish
Pages (from-to)1199-1203
Number of pages5
JournalJournal of Electronic Materials
Volume22
Issue number10
DOIs
Publication statusPublished - 1993 Oct 1

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Keywords

  • (Tl, Pb)-1212
  • Hall effect
  • Mott criterion
  • metal-insulator transition
  • resistivity
  • strontium
  • yttrium

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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